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Definition of geode noun from the Oxford Advanced Learner's Dictionary

geode

noun
 
/ˈdʒiːəʊd/
 
/ˈdʒiːəʊd/
(geology)
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  1. a small hole in rock that has crystals around the inside; a rock containing a geode
    Word Originlate 17th cent.: via Latin from Greek geōdēs ‘earthy’, from gē ‘earth’.
See geode in the Oxford Advanced American Dictionary
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